Mobile Ad Hoc NETwork (MANET) is a collection of mobile nodes interconnected by wireless media. Routing protocols for Wireless ad hoc networks have traditionally focused on finding paths with different link quality metrics such as minimum hop count, RSSI (Received Signal Strength Indication), SNR (Signal-to-Noise Ratio), BER (Bit Error Rate). However, such paths can include slow or lossy links, leading to poor throughput. A routing algorithm can select better paths by explicitly taking the quality of the wireless links in to account. But PSR (Packet Success Rate) is a good metric for characterizing link quality at a coarse-grained level, because it is highly dependent on the packet size and the transmission rate.